MiG-21PF Walkaround by Roy McCarteyThis is a collection of excellent picture of MiG-21PFM details.
The Fuel System
Includes schematics, cockpit indications etc.
Cabin Pressurization and Environmental Control System
The MiG-21 Airborne Radar
Features the RP-21 as well as the RP-22.
The Engine R-11-37F2-S
For more on MiG-21systems visit Tamas Piri's "Fishbeds' Homepage"! Tamas is a citizen of Hungary.